Sony Xperia 1 III Help Manual page 141

Press the camera key fully down.
5
Note
There is no shutter button on the Photo Pro standby screen when the shooting mode is set to the AUTO/P/S/M modes. Use the
camera key on your device.
Related Topic
Taking a photo or recording a video
Auto mode (AUTO)
Program auto (P)
Shutter speed priority (S)
Manual exposure (M)
Camera settings memory
Memory recall (MR)
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